Updated: July 10, 2013
JDeveloper 12c (184.108.40.206.0) is a major release, bringing support for the corresponding new Fusion Middleware release 12.1.2. JDeveloper and ADF 12.1.2 is a culmination of features, functions and bug fixes from the 220.127.116.11.0 and 18.104.22.168.0 releases, and delivers many new features on top of that.
In addition to the many new features which you can read about below, this release contains a plethora of bug fixes. During the development of 12.1.2, defects discovered and reported in 11.1.1.x and 11.1.2.x were fixed first in the 12c code line, and optionally back-ported to other code line(s) if considered safe and justified. As a result, 22.214.171.124.0 has more bug fixes than we can reasonably publish in this document. To check on the status of a particular defect, please work with your Oracle Support contacts and/or My Oracle Support.
Note, some of the new features noted below may cause you to experience deja vu. This list also includes features that were added in 126.96.36.199.0, but not in 188.8.131.52. So, depending on your upgrade path, they may or may not be new to you.
As always, we welcome your feedback on the OTN forum.
Previous Version? If you are looking for the new feature list for a prior 11g release, please refer to the release documentation page.